•Babysitter Entrepreneur. May 8, 15, 22 and 29; 6:30 p.m. Learn how to turn an interest in child or pet care into a profitable enterprise. Ages 13-17.

•Black Fiction. First Saturdays, 1 p.m.

•Challengers. April 27, 2 p.m. Book club for fourth- and fifth-grade students who like a challenge. "The Witches," by Roald Dahl. Ages 9-11. Registration required.

•Chemists Celebrate Earth Day: Water. Sat., April 20, 1 p.m. Join a chemist from the Army Research Laboratory and the American Chemical Society for hands-on experiments. Ages 7 and older. Registration required.

•Good Reads. First Tuesdays, 7 p.m.

•Morning Books with Coffee. Third Tuesdays, 10 a.m.

•Take me out to the Ball Game. April 27, 2 p.m. Steve Walker, author of "A Whole New Ballgame: The 1969 Washington Senators" teaches about baseball in the nation's capital. Ages 6 and older. Tickets required.

Elkridge Branch

6540 Washington Blvd., Elkridge. 410-313-5077.

•Chemists Celebrate Earth Day: Water. Sat., April 20, 3 p.m. Join a chemist from the Army Research Laboratory and the American Chemical Society for hands-on experiments. Ages 7 and older. Registration required.

•Chemists Celebrate Earth Day: Water. Sat., April 20, 10:30 a.m. Join a chemist from the Army Research Laboratory and the American Chemical Society for hands-on experiments. Ages 7 and older. Registration required.